Static eliminator



w. A. SELLER STATIC ELIMINATQR Filed Jul 1, 59

Aug. 26, 1930.

(HIM &

I'NVENTOR Patented Aug. 26, 1930 I UNITED STATES WILLIAM: A. SELLER, ornnennrrnn, iurssounr srnrric summin Application filed .Tuly i, 1'92aSerial no. 371L976...

i 1o invention consists in certain novel'and useful features ofconstruction and organization of parts'as hereinafter described andclaimed; and in order that it may be fully understood reference is to behad to the accompanying drawing which represents certain parts indiagram and other parts in central vertical section.

In the said drawing, where like reference characters identifycorresponding parts in all ofthe figures, A represents a multiple aerialcomprising five parallel wires, the two outside wires identified as 1being connected at one end, the two wires 2 adjacent the outside wires 1being also connected together as illustrated, while the center wire 3 isnot connected. to any ofthe other Wires comprising the aerial. Bindicates four single pole double throw. switches. 1

. Encircled by the dotted line C is any stand- 1 ard radio receivingcircuit and necessary apparatus illustrated as being equipped with asuitable loud speaker 5"having terminal's 6 and 7. The aerial leadconnection for the radio circuit is indicated at Sand the ground 35.connection at 9. I

10 indicates three iron plates and inserted between said plates butprotected from contact therewith by silk cloth inserts ll are-the legsof a U shaped metal conductor 12 having itsends forming terminals 13 and14, the pile I of platesbeing secured together in any suitable mannerand being subjected to th e mag netic field of apermanent,horseshoe'magr 1 fourth switch is connected a wire, 43 to anet 15. V

wardly or toward the coils by a bowedspring metal plate 20 having acent'ral opening 20 phragm 19, as indicated.

said coils is connected by a 'wire 39 directly to 16 and 17 indicate 5electromagnetic coils mounted on the legs of the urshaped magnet Thetension of the bowed plate 20 may be alteredat willby operation ofathreaded cap 21;engaging'the housi'ng21 to, regulate the pressureagainst'the'diaphragm 19as will be readily understood.

The mechanism above described is connected asfollows: Aerial wires 1 -1,22 and 3 are respectively connected to the terminals 22, 23 and'24;of'the switches B, the fourth switch terminal 25 being connectedby awire 26 tothe ground terminal 9 of the receiving set. r i

,The upper four terminals 27 of the switches are connected by awire 28tothe magnet "15 said wire 28 being tapped-bye. wire 29 leading'to onetermina'l of an adjustable resistance 30, the other terminal of saidresistance being connected by wire 81 to an adjustable inductance 82,the other terminal offthe inductancebeing connected by a wire 33 to themagnet '18; 3

The lowerterminals 3.4L of the first'three switches are connected by awire 35 leading. to terminal 13 of element 12, the other terminal 14 ofsaid element being connected by a wire 36 to they aerial terminal 8 ofthe radio receiver. Tapped off the wire 35 is a wire-'37 having its endsoldered or otherwise per-v manently secured to the center of the dia-.'

vThe electromagnetic coils 16 and 17 are connected inseries by a wire38,. and one, of

one terminal 6 of the loud speaker 5, while the other 0011 17 isconnected by wire 39 to, one, terminal of an adjustable inductance 40,the other terminal of said inductance being connected by a wire 41 tothe second termina 7 of the loud speaker circuit.

Tapped off the wire 28 to the upper switch terminals is a wire 42 whichis connected to a.

jpermanentground for the eliminator equip ment. The lower switchterminal of the second permanent ground. 3 a From a consideration. ofthe above it willbe. evident that with all of the switches in theirupper positions all of the aerialsythe eliminatorapparatus and the radioreceiving circuit are connected by the wire 42 to the w i round. It willalso be apparent that by seective operation of said switches any aerialor combination of aerials may be used for the reception of radiosignals, but that in every case the signal must pass through the pile ofplates 10-12.

It will be understood that the inductance 40 must be adjusted toaccommodate the particular type of speaker 5 employed in the receivingcircuit, and that resistance 30 and inductance 32 are adjusted to suitparticular conditions in the grounding of the interference.

The inventor at this time is unable to ex- I I 3 plain justwhat occursin'the mechanism and circuits shown, but his experimentation has proventhat the vconstruction is effective in eliminating extraneousatmospheric and similar electrical noises from the radio receivingcircuit.

I claim:

The combination witha radio receiving set and an aerial therefor, of astatic eliminator element inserted in series between said set and aerialcomprising a metal plate, a magnet so arranged as to affect saideliminator element, a reproducing unit forming a part of the radiocircuit, an electromagnet in parallel with said reproducing unit, adiaphragm 30 adapted to be affected by said electromagnet, a connectionfrom the eliminator element to said diaphragm, and a ground connectionfor said first-named magnet and the coreoi said electromagnet. i

Intestimony whereof I aflix my signature.

WILLIAM A. SELLER.

CERTiFICATE or CORRECTION.

.Patent No. 1,774,068. Granted August 26, 1930, to

WILLIAM A. SELLER.

It is hereby certified that error appears in the above numbered patentrequiring correction as follows: In the grant, and in the heading to theprinted specification, the residence of the patentee should read'fArgentine, Kansas" in- .stead of Argentine, Missouri; and that thesaidLetters Patent should be read with this correction therein that the samemay conform to the record of the case in the Patent Office.-

Signed and sealed this 21st day of October, A. D. 1930.

. M. J. Moore, (Seal) Acting Commissioner of Patents.

